capacitors will not help you in car audio
that is only a 400wrms amp and 2ohm stable so make sure you wire the p3's up to 2ohm or 4ohm (which will only give about 250wrms. if you had the polk subs wired to 2ohm and set the gain properly on the amp, you got as much as the amp could give out and switching subs wont draw more if still set properly at 2ohm.
if you do have problems look into the big 3 upgrade, a larger battery, second battery, or high output alternator (any can be found with the search tool, or going into the tutorial section.) there is also a great write up on why you dont need a capacitor for a daily driver.
wow i must be a slow typer
rd d9 @ .5ohm
2 sa Zv1's 5.8cf tuned to 48 or 32 with port plugs
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